RESUMO
Four new tetrahydropyran derivatives called ophiocerins A-D (1-4) and a new africane sesquiterpenoid (ophioceric acid; 5) have been isolated from cultures of the aquatic fungus Ophioceras venezuelense, together with the known compound regiolone. The structures and relative stereochemistry of these compounds were determined by analysis of 1D and 2D NMR data, while absolute stereochemical assignments for 1-4 were proposed by application of the exciton chirality CD method.
Assuntos
Magnaporthe/química , Piranos/isolamento & purificação , Sesquiterpenos/isolamento & purificação , Dicroísmo Circular , Costa Rica , Água Doce , Estrutura Molecular , Ressonância Magnética Nuclear Biomolecular , Piranos/química , Sesquiterpenos/químicaRESUMO
Communiols E-H (1-4), four new polyketide-derived natural products containing furanocyclopentane, furanocyclopentene, cyclopentene, or gamma-lactone moieties, have been isolated from two geographically distinct isolates of the coprophilous fungus Podospora communis. The structures of these compounds were determined by analysis of NMR and MS data.